Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Com menos de 1 campeonato, qual é a data de fundação da Liga de Rugby da União de Niagara?
 ###Tabelas: CREATE TABLE group_no._4 (group_no._4_id AUTO_INCREMENT PRIMARY KEY, Title VARCHAR, Year INT, Platform(s) VARCHAR, Director VARCHAR, Producer VARCHAR) CREATE TABLE legislation_sponsored_by_john_mccain (legislation_sponsored_by_john_mccain_id AUTO_INCREMENT PRIMARY KEY, Years covered VARCHAR, All bills sponsored INT, All amendments sponsored INT, All bills cosponsored INT, All amendments cosponsored INT, Bills originally cosponsored INT, Amendments originally cosponsored INT) CREATE TABLE european_records (european_records_id AUTO_INCREMENT PRIMARY KEY, Competition VARCHAR, Appearances INT, Played INT, Drawn INT, Lost INT, Goals for INT, Goals against INT) CREATE TABLE sports (sports_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, League VARCHAR, Venue VARCHAR, Established INT, Championships INT) CREATE TABLE pga_tour_career_summary (pga_tour_career_summary_id AUTO_INCREMENT PRIMARY KEY, Year INT, Starts INT, Wins (Majors) VARCHAR, 2nd INT, 3rd INT, Earnings ($) INT, Money list rank VARCHAR, Scoring average VARCHAR)  
SELECT SUM Established FROM sports WHERE Championships < 1 AND League = niagara rugby union